The Origin of DNA and Molecular Structure

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Topics: DNA, Genetics
1950
James Watson & Francis Crick took up the quest of determining the three- dimensional structure of DNA, they believed that the DNA structure would be great importance. Watson and Crick accomplishment was in some measure built on the work of their contemporary
DNA researchers.

1951
Rosalind Franklin x-ray crystallography of the DNA molecule without her know- ledge, for instance, was a vital step toward discovery. She began to capture pictures of
DNA using x-ray diffraction. She also pre- sented her findings in a talk and suggested that the phosphate groups were on the outside of the molecule.

1953
James Watson and Francis Crick deliv- ered the structure of a double helix
DNA molecule. They succeeded in connec- ting pieces, old and new, from friends to foe.

1926
Erwin Schrodinger had introduced an
Equation that describe the behavior of matter. He proclaimed that living and non-living matter all obey the same laws as physics and chemistry, and proposed that living organisms should be treated in terms of molecular and atomic structure.

1865
Gregor Mendel discovered the basic laws of heredity, and first used the word “gene.” He deuced that genes come in pairs and are inherited as distinct units, one from each parent.
He also tracked the segregation of parental genes and their appearance in the offspring of dominant or reces- sive trait.

1869
Friedrich Miescher found substance in pus-soaked bandages, rich in white blo- od cells. He learned that the only source for nuclein was chromosomes, which he realized was a significant discovery. He supported the “chemical heredity theory,” which contends that our basic biological information is passed from generation to generation and is stored in chemical sub- stances in our cells.

1902
Archibald Garrod hypothesized that it was a gene mutation caused the inherited disor- der alkaptonuria, that the disease was un- born. He went

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